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Quo Vadis JUnit

For me JUnit is the most important library of the Java universe. But I think a new version of it is overdue. With it’s approach of having a method definition as a test definition ...
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When a String is Null but Not Null

Introduction A junior programmer on my team at work had an interesting bug.  Its symptoms I have seen more than once.  This post is what to look for and how to prevent it in the future.  ...
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How to Use Callable and FutureTask

Introduction Since Java 1.5 there has been a new set of objects under java.util.concurrent.  This package has a number of different classes including thread queues.  I could have ...
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Explore Git Internals with the JGit API

Have you ever wondered how a commit and its content is stored in Git? Well, I have, and I had some spare time over the last rainy weekend, so I did a little research. Because I feel ...
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Let’s Stream a Map in Java 8 with jOOλ

I wanted to find an easy way to stream a Map in Java 8. Guess what? There isn’t! What I would’ve expected for convenience is the following method:                   public ...
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Why to use String

Recently I was tutoring juniors during a training session. One of the task was to write a class that can dwarwle maps based on some string key. The result one of the juniors created ...
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Java Extension Mechanism Loads All JARs

The Java Extension Mechanism is described in the Java Tutorial as a “standard, scalable way to make custom APIs available to all applications running on the Java platform.” ...
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Supercharged jstack: How to Debug Your Servers at 100mph

A guide for using jstack to debug live Java production servers jstack is like U2 – it’s been with us since the dawn of time, and we can’t seem to be rid of it. Jokes aside, ...
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Revealing the length of Garbage Collection pauses

There are several ways to improve your product. One such way is to carefully track what your users are experiencing and improve based on that. We do apply this technique ourselves and ...
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Understanding strategy pattern by designing game of chess

Today we will try to understand Strategy Pattern with the help of an example. The example we will consider is The Game of Chess. The intention here is to explain strategy pattern and ...
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